不同刨花楠种植模式对土壤理化性质及分形维数的影响  

Effects of different planting patterns of Machilus pauhoi on soil physicochemical properties and fractal dimension

作　　者：彭家顺 雷开敏 郭晓敏[1,2] 牛德奎[1,2] 刘晓君 兰龙焱 PENG Jiashun;LEI Kaimin;GUO Xiaomin;NIU Dekui;LIU Xiaojun;LAN Longyan(College of Forestry,Jiangxi Agricultural University,Nanchang 330045,Jiangxi,China;Jiangxi Provincial Key Laboratory of Silviculture,Jiangxi Agricultural University,Nanchang 330045,Jiangxi,China)

机构地区：[1]江西农业大学林学院,江西南昌330045 [2]江西农业大学森林培育重点实验室,江西南昌330045

出　　处：《中南林业科技大学学报》2022年第1期111-119,共9页Journal of Central South University of Forestry & Technology

基　　金：国家自然科学基金项目(31760233)。

摘　　要：【目的】分析不同刨花楠种植模式对土壤分形维数和可蚀性以及土壤理化性质的影响,为刨花楠复合种植提供理论依据。【方法】选取婺源生态林场近自然恢复条件下2年生刨花楠纯林(A)、2年生刨花楠-8年生杉木混交林(B)、8年生刨花楠-8年生杉木混交林(C)、8年生刨花楠-8年生湿地松混交林(D)和8年生刨花楠纯林(E)5种刨花楠种植模式,各模式3个重复,共15块样地,进行了野外调查取样,分析不同刨花楠种植模式下土壤分形维数和可蚀性以及理化性质之间的差异。【结果】各种植模式土壤有机质、全氮、全磷和全钾含量的均值分别为15.77~42.50、0.85~2.01、0.69~1.38和7.84~10.17 g/kg。综合来看,B模式土壤的养分状况较其他模式更加优良。土壤分形维数与砂粒、黏粒、全氮以及全磷含量有显著相关性(P<0.05),而土壤可蚀性大小与砂粒、粉粒以及土壤全钾含量相关性显著(P<0.05)。各个种植模式土壤分形维数在2.76~2.80之间,土壤可蚀性的变化范围在0.055~0.059之间。A和B模式的土壤分形维数显著小于其他模式(P<0.05),而各模式的土壤可蚀性之间无显著差异(P>0.05),说明随着林龄的增加,土壤的分形维数逐渐增大。【结论】刨花楠混交林并不能改善土壤养分状况;种植年限和土壤机械组成对土壤分形维数影响较显著,但土壤可蚀性大小仅与机械组成有关;土壤分形维数和可蚀性均能较好地指征土壤理化性质。【Objective】The aim of the study was to characterize the effects of different planting patterns of Machilus pauhoi on soil fractal dimension,erodibility and physicochemical properties,to provide a theoretical basis for the compound planting of Machilus pauhoi.【Method】Five types of Machilus pauhoi planting patterns under near-natural restoration conditions were included in this study.They are the two-year-old pure forest of Machilus pauhoi(A),the mixed forest of two-year-old Machilus pauhoi and eight-yearold Cunninghamia lanceolata(B),the mixed forest of eight-year-old Machilus pauhoi and eight-year-old Cunninghamia lanceolata(C),the mixed forest of eight-year-old Machilus pauhoi and eight-year-old Pinus elliottii(D)and the eight-year-old pure forest of Machilus pauhoi(E)in Wuyuan ecological forest farm.In the experiment,each planting pattern was analyzed with fifteen sample plots,and with three replicates.Field survey and sampling were carried out to analyze the differences in soil fractal dimension,erodibility,and physicochemical properties under different planting patterns of Machilus pauhoi.【Result】The results showed that the average contents of soil organic matter,total nitrogen,total phosphorus and total potassium of each planting pattern were 15.77-42.50 g/kg,0.85-2.01 g/kg,0.69-1.38 g/kg and 7.84-10.17 g/kg,respectively.In general,the soil nutrient status of pattern B was better than that of other modes.The fractal dimension of soil had a significant correlation with the contents of grit,clay,total nitrogen and phosphorus(P<0.05),while the soil erodibility exhibited a significant correlation with the contents of grit,silt and total potassium(P<0.05).The fractal dimension of soil under each planting pattern was between 2.76 and 2.80,and the variation range of soil erodibility was between 0.055 to 0.059.The fractal dimension of soil in A and B patterns was significantly lower than that of other patterns(P<0.05).However,there was no significant difference in soil erodibility among different pattern

关 键 词：土壤机械组成 土壤分形维数 土壤可蚀性 种植模式 刨花楠 

分 类 号：S714.2[农业科学—林学]